How did Earth get so much water?

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Earth would have been too hot to have any kind of condensation of liquid water early in our solar system, raising a problem for how water got onto the planet.
The earliest planets were melted due to the release of energy from collisions, and Earth used to be a bright orange molten magma marble.

Life as we know it needs water, but scientists can’t figure out where Earth’s water came from. Answering that question is just one piece of an even bigger mystery: “Why are we here?”

This is the first episode in our new three-part series, Origins, about the beginnings and boundaries of life on Earth.

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